ASTM D924 PDF

April 20, 2020 0 Comments

ASTM D Standard Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids. Find the most up-to-date version of ASTM D at Engineering We perform testing by ASTM D on electrical insulating liquids used in cables, transformers, oil circuit breakers, and other electrical apparatus.

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Mercury, or its vapor, may be hazardous to health and corrosive to materials. Cleaning Test Cell Preparation of Specimen and Filling Test Cell Some liquids, such as oils of petroleum origin, undergo changes when exposed to sunlight.

D — 08 FIG. For routine tests, however, the requirement for a guard electrode may be waived, provided that the two-electrode cell used is of adequate capacitance and with sufficient ratio of surface area to sample thickness, in order to provide proper operation of the measuring equipment. It is required, however, aztm the precision of the measurements meets the intended accuracy of this test method. Insert the inner electrode and rinse the electrodes by twice raising and aztm the inner electrode.

Replace the inner electrode. Plated surfaces that may be satisfactory for testing liquids having dd924 acidity and for short periods of time are gold, platinum, nickel, chromium over nickel, or rhodium.

Leakage across these paths has been found to produce an unsteady bridge balance on some bridges. For decimal values up to 0.

Once receive your question, the supplier will answer you as soon as possible. Measurements are made at many different temperatures. We Do Our Best for Asym Signicance and Use 4. As a precaution against this eventuality, use a suitable stopper to plug this opening prior to starting the cleaning operation. Find Similar Products By Category.

ASTM D924 Large-Screen Auto Washing Insulating Oil Dielectric Loss Tester

In general, since the dissipation factor or power factor of insulating oils in good condition have decimal values below 0. Allow the sealed container to stand undisturbed in the room in which the test is to be made for a sufficient period of time to permit the sample to attain room temperature before it is opened.

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If it is not feasible, the length of time the sample is exposed to atmospheric conditions must be kept to a minimum. Internal standard capacitor electrode type capacitor,with electrode spacing 2mm.

Rinse all parts thoroughly with hot tap water, then with cold tap water, followed by several rinses with distilled water. Enter between 20 to 4, characters. If the difference in the measurements of the two test specimens is equal to or less than 0. Take care that the asfm on which the component parts of the cell are placed in the oven are clean. No minimum capacitance is therefore suggested. Use a perforated ceramic plate or disk to asstm the test cell from the metal ooring of the oven if the ooring is not insulated from the oven.

Metals that have been found satisfactory from this standpoint are gold, nickel, Monel, platinum, and stainless steel. Caution should be taken when handling mercury and mercury containing products.

ASTM D924 method Transformer Oil Dielectric Loss And Tan-delta Tester

Consult such procedures before samples are taken. Record data as soon as the test temperature is reached. For this reason, clean and dry the cell immediately prior to making the test, ast strictly observe the procedures and precautions outlined in For tests at room temperature the unheated oven can be conveniently used as the test chamber.

NOTE 1—The dissipation factor of an electrical insulating liquid usually decreases with increasing frequency in the frequency range covered by Insulating oil dielectric loss and resistivity tester is used for measuring dielectric dissipation factor and DC resistivity of insulating oil and other insulating liquids. However, an intermediate value of relative permittivity may sometimes be advantageous in achieving a better voltage distribution of ac atm fields between the liquid and solid insulating materials with which the liquid may be in series.

Contact Now Customized Request. This standard has been approved for use by agencies of the Department of Defense.

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If you feel that your comments have not received a fair asfm you should make your views known to the ASTM Committee on Standards, at the address shown below. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Take care not to lay the electrodes on any surface. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations ast to use. Mercury, or its vapor, may be hazardous to health and corrosive to materials. A number in parentheses indicates the year of last reapproval.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

The oven must be capable of meeting the temperature requirements set out in Section Dissipation factor or power factor may be useful as a means of quality control, and as an indication of changes in quality resulting from contamination and deterioration in service or as a result of handling.

ASTM D液体绝缘材料介质损耗测试法_百度文库

Use a shielded wire or coaxial cable for connecting the guard and measuring electrodes to the bridge. In general, since the dissipation factor or power factor of insulating oils in good condition have decimal values below 0. Stir x924 uid frequently during heating. It is therefore desirable that the elapsed time necessary for the test specimen to attain temperature equilibrium with the test cell be held to a minimum.

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